Every operator we cover runs some version of a welcome bonus, and on paper they can look nearly interchangeable — a percentage match up to a dollar cap. In practice, the terms attached to that match are what actually determine whether a promo is worth claiming, and they vary more than the headline number suggests.
The single most important term is the wagering, or playthrough, requirement: how many times the bonus amount (or sometimes the bonus plus deposit) has to be wagered before it converts to withdrawable funds. A 100% match with a 10x playthrough requirement is, in practical terms, a worse offer than a 50% match with a 3x requirement for most bettors, even though the headline number is smaller. We list the effective playthrough for every operator we review in that book's individual review, specifically because the headline bonus percentage alone is close to meaningless without it.
Second, check whether the bonus releases incrementally as you meet playthrough or only after the entire requirement is cleared. Incremental release matters because it gets usable funds into your account sooner and reduces the risk of losing the whole bonus to one bad stretch before ever seeing a dollar of it.
Third, look for maximum bet size restrictions while wagering through a bonus. Some operators cap the stake you can place using bonus funds at a low fixed amount regardless of your bankroll, which can stretch the time needed to clear playthrough considerably longer than the raw multiplier suggests.
Reload bonuses — offered on top of an existing account rather than only at signup — are worth paying attention to separately, since a handful of operators (Emerald Bay's standing crypto reload is the clearest example among books we cover) offer these on a recurring basis rather than as a one-time new-account perk. Over a full season, a smaller recurring reload can be worth more than a bigger one-time welcome bonus.
Finally, odds boosts and profit-boost tokens are usually the easiest promo type to evaluate: read the specific market the boost applies to, confirm there's no hidden stake cap, and compare the boosted price to the market's standard price elsewhere before assuming it's genuinely +EV. Not every boost is — some just bring an inflated line back down to roughly fair value.
Our advice, unchanged across every review we've written: read the terms page before you deposit, not after, and don't treat the headline percentage as the whole story.